“There is extensive concern about rate increases next year,” said Avalere Health’s Vice President Caroline Pearson. “Particularly since early exchange enrollment is skewed toward older enrollees, some are concerned that plans will need to raise prices in 2015.”

Rates won’t be announced until the fall, however, and Pearson cautioned that it’s still too early to know what they are likely to be since the enrollment period for this year is still ongoing.

The industry’s concerns of rising premiums are largely out of step with Health and Human Services Secretary Kathleen Sebelius’s comments at a congressional hearing last week, where the secretary downplayed any potential sticker shock.

“The increases are far less significant than what they were prior to the Affordable Care Act,” Sebelius said in testimony before the House Ways and Means Committee.

But insurers say a combination of Obamacare’s new taxes and fees, as well as rule changes and delays announced to cope with the rocky rollout, will likely contribute to higher than expected rates.

For instance, the administration’s decision to allow people to keep their old policies likely means that fewer people than anticipated are enrolling on the new exchanges.

This is bad news for the Obama administration, which has routinely pointed out that premiums on the exchanges are less expensive than comparable employer-based policies. While premiums may be cheaper, out of pocket costs on exchange plans tend to be higher. A survey by HealthPocket.com found the deductibles on the exchange plans were 42 percent higher than employer based policies. But now, insurers say Obamacare consumers can expect to experience sticker shock from both premiums and deductibles.

Still, administration officials as well as health policy experts say the rising cost of premiums and deductibles were an issue even before the law took effect.

“The bottom line is that we just don’t know. Premiums were rising 7 to 10 percent a year before the law. So the question is whether we will see a continuation of that sort of single digit increase, as Sebelius said, or whether it will be larger,” MIT professor and one of the architects of Obamacare, Jonathan Gruber told The Hill.

Insurers say not everyone will see premiums rise significantly. That’s because the rates vary depending on the region and carriers available in the area.

For instance, counties that have a population that skews older or have only one major hospital system in the area will likely be hit with higher premiums. In contrast, places with a mix of healthier younger people and more competition for providers will likely see lower premiums.